Malicious PDF — malware analysis report

Static analysis result for SHA-256 269dbe0b1abc17c9…

MALICIOUS

PDF

78.1 KB Created: 2021-04-04 08:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a912bce1a8a34e12dec2a58f7844d9bf SHA-1: 6c430cdd974ce630117293f1b58a5fe133e477f0 SHA-256: 269dbe0b1abc17c9bf240d616b496761bf78d38413a0dc8fde3e53f4b1ef430b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML heuristics also flagged the PDF as malicious, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/123?utm_term=show+back+arrow+in+toolbar+android PDF link annotation
    • http://favowavuwoxi.iblogger.org/cs_lewis_the_4_loves.pdfIn PDF document text
    • http://towilevelogefok.22web.org/97972676210.pdfIn PDF document text
    • http://liwuzagesasa.22web.org/cpm_homework_help_algebra_2_answers.pdfIn PDF document text
    • http://menegatuje.iblogger.org/kindle_email_address_convert.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/91443d35.pdfIn PDF document text
    • https://wubudonujekud.weebly.com/uploads/1/3/4/5/134524452/suweka.pdfIn PDF document text
    • https://tuvugeti.weebly.com/uploads/1/3/4/1/134108896/8892602.pdfIn PDF document text
    • http://kowubowawij.iblogger.org/stephen_king_movie_2019_netflix.pdfIn PDF document text
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/cc5bc90.pdfIn PDF document text
    • https://fimopoki.weebly.com/uploads/1/3/4/0/134040487/deduwasomubuweg_riwovu_bowegamitupefoj_negebajesevese.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/rodegupojoxoluxugavitoj.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/c0b7e20.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/fovagokoxag-zoludawi-rinelebonena-risorake.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/zavidedarenodobo.pdfIn PDF document text
    • http://rovosome.22web.org/slope_stability_calculation.pdfIn PDF document text
    • https://kiteginizi.weebly.com/uploads/1/3/1/8/131871518/bobuzop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaxurotowikofew.rf.gd/ritiwaselerod.pdfIn PDF document text
    • http://ledonapagemes.epizy.com/vutimojivivuzebenadiruk.pdfIn PDF document text
    • http://lidagigum.rf.gd/tidiwowobizagekenipujose.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/3587537259.pdfIn PDF document text
    • http://lufevexos.atwebpages.com/85154560575.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/army_decision_brief_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 5248 bytes
SHA-256: 056f776aa01017c14626cc60fdec60026b4f998aa1b43da7d3c6317981f0759c
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 11136 bytes
SHA-256: aa001c2637857cbab476b225fad4f6a168c9cfdca9561cbcb02aa2c6f302664d

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